Thomas b



T. Bf ATTERBURY.

No. 453,875. Patented June 9,1891.

- W WIINESSE S.

' UNITED ST TES-PATE T OFFICE-.-

THOMAS 13.:ATTERBURY, OF ALLEGHENY, PENNSYLVANIA.

GLASS-MOLD.

SPECIFICATION forming part of Letters Patent No. 453,875, dated. June 9,1891.

Application filed my 8, 1887- Serial No. 223,730. (No model.) I

To all whom it may concern.-

Be it known that I, THOMAS B. ATTERBURY, of Allegheny city, in the county of Allegheny and State of Pennsylvania, have invented a new and useful-Improvement in Glass-Molds; and I do hereby declare the following to be a full, clear, andlexact description thereof.

Bulbs for incandescent lamps are made of glass by blowing, usually in a mold. The sides of the bulb are very thin, and as it is exhausted of air and has to resist the external pressure of the atmosphere its stability is affected by engraving, cutting, or etching of the surface. Consequently it has been oustomary to make these bulbs'without any engraying, lettering, or other-cutting upon them.

The obj set of my invention is the production pfgan'in'candescent-lamp bulb with any desired lettering or marking to indicate its manufacture or ownership thereon, Without affecting the strength or stability of the article.

To enable others skilled in the art to make and use my invention, Iwill now describe it by reference to the accompanying drawings, in which Figure l is a vertical section of the mold and ring. Fig. 2 is a like viewwith the neckring detached from the mold, and Fig. 3 is a view of the bulb.

Like letters of reference indicate like parts in each.

The mold a is formed of twoparts, which are united together by hinges or in any other known manner when in use, At the top it is cored out into a cylindrical shape, as shown at I), andin this cylindrical part Z) is an annular ring or flange 0, extending horizontally, and on the upper end is a vertical ring or flange (7 Fitting into the cylindrical part b is a two-part neck-ring 6, provided with a flange f, which takes under. the flange c, and an angular flange g, which extends over and encircles the vertical flange (Z. The molding cavity in which the bulb in is formed extends up into the rjn g e and terminates in a straight or cylindrical part, which forms the stem at of the bulb. In or upon the said molding cavity of the ring 6, 1 form the letters or patterns which I desire to communicate to the bulb on.

gother impressions or mold-marks.

Thus constructed, the operation of my improvement is as follows: The mold being put together with the ring 6, in placeflthe blower gathers a sufficient quantity of glass and in serts it into the mold in the usual way, and then blows it out into the form of a bulb: As soon as it comes in contact with the moldingsurface of the ring e, he rotates the blow-pipe, and the glass, sticking against the surface of the ring e, causes it to rotate with the bulb. The continued blowing of the glass causes it to expand into or around the marks, letters, or patterns on the inner surface of the ring 6, and thereby said figures, letters, or patterns are communicated to the surface of the bulb, as illustrated by Fig. 3. hen the blowing is completed, the mold and ring are opened and the blower withdraws the bulb, so as to free the bulb, which can then be withdrawn from the lower end of the ring, after which it is submittedto the other-operations neeessar to its completion. t

In the ordinary way of making these bulbs the glass is revolved inside of the mold to obliterate all mold-marks and to make a brilliant and finished surface. This revolution prevents the use of the mold to impart any pattern, name, or device to thesurface of the bulb. By making the ring 6 separate from the mold and capable of revolving. with the glass, I am enabled to use .itto impart the.

pattern, name, or device to the bulb free from It is apparent that the situation of the ring or movable section of the mold may be changed with out departing from my invention-that is to say, that instead of having the ring a placed in theanouth of the stationary mold it may be placed in the sides of the molding-cavity at any desired point, so that when the revolving bulb of glass comes in, contact with it it will be caught by and revolved with the bulb. It is also apparent that this invention may be applied to the manufacture of lamp- ,ohimneys and other blown articles of glassware having a round cross'section by merely changing the shape of the mold to suit. The ring 6 is made very light, so as to turn freely with the glass and enable the bulb to be made very thin. I can in this way produce any desired name, lettering, or device on the bulb without reducing its strength or affecting its durability, and without additional cost of manufacture.

What I claim as my invention, and desire 5 to secure by Letters Patent, is- I A stationary mold for making blown incandescent-lamp bulbs and other hollow glass articles having aloose sectional ring provided with a name, character, or device, said ring 10 being capable of revolving-with the glass as it v is turned or revolved in the mold, substantially as and for the purposes described.

httestimony whereof I have hereunto set my hand this 17th day of? November, A. D.

W. B. CORWIN, THOMAS B. KERR. 

